Comparison of Hydrochloric Acid (HCl) and Nitric Acid (HNO3) Usage in the Leaching Process and Silica Extraction from Fly Ash
Uli Ulfa, Husna Muizzati Shabrina, Perwitasari, Heni Anggorowati, Gabriela Michelle Valentcia, Fadhlyatul Bella Nursiva

Universitas Pembangunan Nasional Veteran Yogyakarta

Abstract

Waste from coal-burning power stations and other sectors that rely on coal as a source of energy is one of the environmental issues. Subsequently, a great deal of study was conducted on the application of flying ashes coal. Among the techniques for making
use of the Flying Ashes of Coal is the extraction of silica. This study carried out the comparison in the usage of Acid solvent (HCl and HNO3) in the leaching process and silica extraction from fly ash with various temperature (30, 45,60,75, and 90 C) and time (1 and
2 hours). The highest percentage of leached solid was obtained at 42.15% using HCl solvent at 90 C for 2 hours. Meanwhile, the percentage of extracted silica obtained was 8%

Keywords: Fly ash, Silica, HCl, HNO3, Extraction

Topic: Engineering